How to extract a lot of coins from the earth?

The most important thing in this matter is not to rush, and remember that coins can be very close, so without pinopintera here will be difficult to do.
 
If there is no pinpointer, then you can use the special pinpointing function, but unfortunately not every detector has such a function.

Another option for accurately determining the location of targets is a miniature coil "sniper" of small diameter.
 
Cut the ground in two ways: the first - a square, focusing on the depth of detection of targets, the second - semicircular pieces, while the groove should be either cone-shaped or V-shaped.

Each piece of land should be carefully examined with a pinpointer or carefully disassembled. Coins should not be damaged, so you need to act very carefully.
  
After extracting the placer of coins, there will be many excavated holes, so care must be taken to eliminate the consequences of the cop, so as not to cause unnecessary conversations and not put the case of treasure hunt in the eye, in principle.